fix toc

Author: mmcky

lectures/_toc.yml

@@ -19,11 +19,11 @@ parts:
   - file: business_cycle
   - file: inflation_unemployment
   - file: inequality
+  - file: distributions
   - file: cross_section
 - caption: Useful Tools
   numbered: true
   chapters:
-  - file: distributions
   - file: geom_series
   - file: linear_equations
   - file: eigen_I